BERNINI C.

Several methods have been tested in order to prepare the perovskite type compound MgxCyNi3 applying the mechanical alloying (MA), the self-propagating high-temperature synthesis (SHS) and the isothermal heating techniques in the different steps of preparation. These methods may be summarized as follows: method MCN-1) synthesis of the MgxCyNi3...

We present thermal conductivity and specific heat measurements on MgB2 and Mg-AlB2 samples. Thermal properties have been analyzed by using a two-gap model in order to estimate the gap amplitudes, Delta(0)(pi) and Delta(0)(sigma) and the intra-band scattering rates, Gamma(sigmasigma) and Gamma(pipi). Delta(0)(sigma) rapidly decreases as a...

We studied the upper critical field in poly-crystalline MgB2 samples in which disorder was introduced by different ways: Al substitution and neutron irradiation. We observed that by Al doping critical temperature Tc decreases, the resistivity increases but the upper critical field, Hc2, decreases. This behavior can be explained considering that...

The ability to control the spatial arrangement of molecular nanocrystals is of fundamental importance for the fabrication of nanoscale devices. In this work, we report on experimental procedures to control the formation of 50 nm, organically capped, gold nanoparticles by tuning the deposition conditions. We found the parameters which lead to...